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Tropospheric Gas Detector 



.1 



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Tropospheric Gas Detector 

Written By: Eric Weinhoffer 

SUMMARY 

All components required for the build are included in the Maker Shed Atmospheric Gas 
Detector Kit . Directions come directly from the Atmospheric Monitoring with Arduino book, 
which is included in the kit. 

Before you begin: The two gas sensors are shipped in separate, labelled, bags but look 
identical (unlike the sensors shown in this project). In order to differentiate between the two, 
mark one of them with a Sharpie, or another method, immediately after taking them out of 
the bag. 



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Tropospheric Gas Detector 



Step 1 — Tropospheric Gas Detector 








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• Make sure you have all the parts necessary for the build. Everything you need, other than 
an Arduino, is included in the Maker Shed Atmospheric Gas Detector Kit . 

• We're going to start with the ground rails on the breadboard. Wire them up like the photo! 

• Your placement doesn't have to be exact - as long as you're getting GND to two rows on 
the breadboard with a reasonable distance between them, it's all good. 

• We'll be using a few flat jumper wires to assemble this device for the sake of 
photography, but the flexible jumper wires included in the kit will work just fine. 







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Tropospheric Gas Detector 



Step 2 




• Next, place the transistors on the breadboard. Their collector leg, the left-most one when 
the flat part of the body is facing you, should go to GND. 

• Now wire up the two 1kQ resistors. They should go from the base leg of each transistor 
(the middle one) to the opposite side of the breadboard, as shown in the second photo. 

• Next, add the two gas sensors. The sensor cables have male headers on one end, so they 
can be plugged right into the breadboard. The black (GND) wire should line up with the 
emitter, or rightmost, pin of the transistor. Repeat this process for the MQ-2 sensor. 



Step 3 




• If you haven't done so already, now would be a great time to get some power to those 
sensors, via the power rail on your breadboard. Use two jumpers to connect to the red 
wires of each sensor cable from the rail. 

• Now use a jumper to connect the GND rail on your breadboard to one of the GND pins on 
your Arduino board (not included in the kit). 



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Tropospheric Gas Detector 



Step 4 




• Now connect the MQ-6 and MQ-2's data wires (colored white) to the Arduino. The MQ-6 
goes to A5 and the MQ-2 goes to A4. 

• Next, Digital pins 12 and 9 on the Arduino need to be connected to the MQ-6 and MQ-2 
resistors, respectively. The Arduino will use these pins to activate the heaters inside each 
sensor. 



Step 5 




• Now it's time to plug in the LCD. 
Connect the four-pin cable to the 
LCD breakout board, and four 
jumpers to the other (black) end of 
the cable. 

• Hook the VCC pin (red) up to the 
5V rail on the breadboard, the GND 
pin (black) up to a GND rail or pin, 
the white (RX) to Digital Pin 5 on 
the Arduino, and the yellow (TX) to 
Digital Pin 3 on the Arduino. 



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Tropospheric Gas Detector 



Step 6 




• When it comes to powering the 
device, you can plug your Arduino 
5V output into the power rail on the 
breadboard, or refer to page 21 of 
the book for a way to power the 
circuit with the included voltage 
regulator and 9V battery clip. 

• And that's it, you're done! You can 
find some "Getting Started" code 
for the Gas Detector here and refer 
to the Atmospheric Monitoring with 
Arduino book for ways to expand 
the project. 



This document was last generated on 2013-02-11 09:15:48 PM. 



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Page 5 of 5